APM4AM-SAT Sends Two Packets

Why does my APM4AM-SAT send in two packets every time it transmits?

The APM4AM-SAT has a limited packet size and cannot send the data for all six channels in one packet. It sends in a packet for Channels 1 through 4 and a separate packet for Channels 5 and 6. If you are only using Channel 5, and you have any of the first four channels active, then the unit will send in two packets. If you would like only one packet sent, disable the first four channels.